Think about that statement before you dismiss it. Microbes. What kind? What if there's one there that's a virus we have no means of keeping from killing us? They didn't say micro-organisms, tiny plankton-like things. They said 'microbes'.

The truth is we don't know. But there's already no shortage of microbes, bacteria, viruses and large beasts that can hurt us. The world in an inherently dangerous place. Wash your hands, get your vaccines and stay away from large carnivores and you should be fine.